Viewers of a webcam that shows nesting eagles in Pittsburgh on Tuesday saw the adult eagles bring a cat to the nest to feed two young eaglets.Some viewers were disturbed that the image was caught on camera which, in most instances, is viewed by those eager to track the progress of the nesting birds.    But Rachel Handel, a spokeswoman for the Audubon Society of Western Pennsylvania, tells the Pittsburgh Post-Gazette that the feeding behavior was perfectly normal.    Handel writes on Facebook that, "While many may cringe at this, the eagles bring squirrels, rabbits, fish (and other animals) into the next to eat multiple times each day."    Handel says the group couldn't determine if the cat was a pet or feral.